JP2006077492A - Earthquake resisting pier - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earthquake resisting pier capable of preventing the collapse of the pier irrespective of the direction of an indefinite vibration of an earthquake and having a low manufacturing cost. <P>SOLUTION: A steel pipe pile K as the foundation is placed on each summit forming a polygon to the ground, and each column 20 is connected to the upper end section of the steel pipe pile K. A tie member 30 connecting both columns 20 and 20 adjacent to each other is so constituted that a mounting steel materials 31 of both end sections connected to the column 20 and a low yield point steel material 32 provided between the mounting steel materials and formed of a steel material having a yield point lower than that of each mounting steel material 31 are connected by means of welding. In this way, the tie member 30 is connected to the columns 20 and 20 adjacent to each other so that four sides of a regular square can be formed in each column 20 placed on each summit of the regular square against ground G to form one earthquake resisting pier 10 by bundling four columns 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an earthquake-resistant pier that can withstand earthquake shaking.

In general, seismic structures, seismic isolation structures, vibration control structures, and the like are employed for structures in order to cope with earthquake vibrations when an earthquake occurs.
For example, in the case of a steel pier 300 as shown in FIG. 13A, a column part 320 made of a steel plate in a box shape or a cylindrical shape is provided on a footing 330 made of concrete, and this column part 320. A base plate 340 is provided at the lower end of the base plate 340, an anchor frame 370 is embedded in the footing 330, and the base plate 340 and the anchor frame 370 are fastened by an anchor bolt 350 and nuts 360 and 360 to Are connected. The steel pier 300 constructed as described above can withstand the seismic force until the column portion 320 yields and is damaged. Therefore, if the column part 320 yields and is damaged, a large-scale repair of the entire viaduct as well as the pier is necessary, so that the structure of the pier needs to be sturdy.
Then, the earthquake-resistant pier which has an earthquake-proof structure as shown in patent document 1 and patent document 2 is proposed so that the pillar part 320 of a pier may not yield and damage, for example.

As shown in FIG. 13B, the earthquake-resistant pier 300a disclosed in Patent Document 1 has an upper bracket 380a attached to the upper part of the column part 320 and a lower bracket 380b attached to the base plate 340 on the lower side of the column part 320. Between the upper bracket 380a and the lower bracket 380b, rod members 310 having vibration damping members 390 and 390 are arranged at both ends, and the vibration damping members 390 and 390 at the ends are connected to the upper bracket 380a. Alternatively, it is joined to the lower bracket 380b. Here, the vibration control member 390 is formed of a steel material having a lower yield point than the column portion 320. Thereby, when the earthquake-resistant bridge pier 300a vibrates due to an earthquake, the damping member 390 yields before the column portion 320, so that the column portion 320 is not yielded and damaged, and the earthquake-resistant bridge pier 300a is protected from earthquake vibration. be able to.
However, in such an earthquake-resistant bridge pier 300a, when the bar member 310 is greatly shaken by the vibration of the earthquake, the vibration of the bar member 310 is applied to the vibration control member 390 in a state added to the vibration of the earthquake. There is a risk that after the earthquake occurs, the damping member 390 may yield at an early time when the seismic force is small. In this case, if the damping member yields at an early stage, there is a risk that the vibration of the earthquake will apply a load to the column portion 320 of the earthquake resistant pier 300a, yielding and damaging the column portion 320. In addition, if the lower damping member 390 yields, the rod member 310 may sway and damage the column portion 320. If the upper damping member 390 yields, the lower damping member 390 may be damaged by the weight of the rod member 310. The seismic member 390 may surrender and the bar member 310 may collapse around the road.
Furthermore, the anchor frame 370 embedded in the footing 330 is expensive, and is one of the causes of the cost increase of the earthquake resistant pier 300a. Such an expensive earthquake-resistant bridge pier 300a is difficult to cope with a budget reduction for road construction in the reduction of public works. Therefore, an earthquake-resistant bridge pier with an inexpensive earthquake-resistant structure is desired while ensuring the conventional earthquake resistance.

Further, as shown in FIG. 14, an earthquake-resistant bridge pier 400 shown in Patent Document 2 is an extremely soft low yield point on an earthquake-resistant beam 420 provided between a pair of standing legs 410 and 410 in a ramen pier. The structure is equipped with a steel material 421. When an earthquake occurs, the ultra-soft steel material 421 first yields or deforms beyond the yield point to protect the earthquake resistant pier 400 (ramen pier). Can be done.
However, since such an earthquake-resistant bridge pier 400 is uncertain in which direction the shaking due to the earthquake acts, the earthquake-resistant beam 420 provided only in one direction cannot cope with the shaking of the earthquake that shakes in an uncertain direction. There was a fear.
In the case of the seismic bridge pier 400 (ramen pier), since the space between the leg 410 and the leg 410 is wide, if the seismic beam 420 is provided at this space, the seismic beam 420 needs to be increased in size and performance. There is also a problem that the manufacturing cost of the earthquake-resistant beam 420 increases.
In addition, since such a seismic resistant beam 420 can be applied only to a ramen pier type, there is a problem that versatility is low.
JP-A-10-131120 (paragraphs 0020-0029, FIG. 3) JP 2001-64913 A (paragraphs 0020 to 0029, FIG. 1)

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-described problems, to prevent a pier from collapsing regardless of an uncertain earthquake shaking direction, and to provide an earthquake-resistant pier having a low construction cost.

  In order to solve the above-mentioned problem, the present invention comprises a plurality of column members erected on a foundation, and a connecting member that connects the adjacent column members, and each of the column members is a steel pipe material, The seismic bridge pier is characterized in that the connecting member is deformed when each column member swings.

In this manner, the connecting members are connected to the adjacent column members, and the connecting members are deformed when the respective column members are shaken, so that the collapse due to the shaking of the respective column members can be prevented.
Moreover, it is possible to reduce the manufacturing cost by using a ready-made steel pipe material for the column material, and the installation cost of the earthquake-resistant pier by shortening the erection period of the column material (steel pipe material).
The construction cost is a total cost of production cost and erection cost.

  Moreover, this invention is invention of Claim 1, Comprising: These pillar materials are each arrange | positioned on the vertex which forms a polygon, It is an earthquake-resistant pier characterized by the above-mentioned.

  “Arrange each on the vertex forming the polygon” means that a plurality of column members are respectively arranged at the vertex position of the polygon so as to draw the polygon with respect to the ground.

  In this way, since the plurality of pillars are arranged on the vertices forming the polygon, by connecting the connecting members to the plurality of pillars, regardless of the direction of uncertain earthquake shaking. The column material can be protected.

  Moreover, this invention is invention of Claim 1 or Claim 2, Comprising: The low yield point provided between the steel materials for attachment in which the said connection member is attached to each said column material, and these steel materials for attachment An earthquake resistant pier comprising a steel material, wherein the yield point of the low yield point steel material is set lower than the yield point of the mounting steel material and the column material.

In this way, the connecting member is composed of a mounting steel material to be attached to the column material and a low yield point steel material having a lower yield point than the mounting steel material, and the mounting steel material is attached to both ends of the low yield point steel material. It is provided and it arrange | positions between adjacent pillar materials, and attaches the steel material for attachment to a pillar material.
As a result, when each column member is shaken by the seismic force, a shear force acts on the connection member due to the relative displacement of each column member at the position where the connection member is attached, and the low yield point steel material of the connection member is the steel material for mounting. And yield before the column.
In this way, the connecting member is provided with the low yield point steel material, so that the low yield point steel material yields first and the seismic energy is absorbed before the column material yields, so the earthquake does not yield or damage the column material. It can be protected from power.

  Moreover, this invention is invention of Claim 1 or Claim 2, Comprising: The said connection member is the steel material for attachment attached to each said column material, and the rubber damper member provided between these steel materials for attachment And the rubber damper member undergoes shear deformation.

As described above, the connecting member is composed of the mounting steel material attached to the column material and the rubber damper member that undergoes shear deformation, and includes the mounting steel material at both ends of the rubber damper member, Place the steel material for mounting on the column material.
As a result, when each column member is shaken by the seismic force, the rubber damper member of the connecting member undergoes shear deformation even if a shearing force acts on the connecting member due to the relative displacement of each column member at the position where the connecting member is attached. It can absorb the seismic energy.
As described above, since the connecting member includes the rubber damper member, the column member can be protected from the seismic force without yielding or damaging.

  Moreover, this invention is invention of any one of Claim 1 thru | or 4, Comprising: The said connection member is provided so that replacement | exchange is possible, It is an earthquake-resistant bridge pier characterized by the above-mentioned.

  In this way, by making the connecting member replaceable, for example, even when the connecting member is damaged due to an earthquake or secular change, it can be replaced with a new connecting member. Performance can be maintained.

  According to such an earthquake-resistant pier, it is possible to prevent the pier from collapsing regardless of the direction of uncertain earthquake shaking and to reduce the construction cost.

A best mode for carrying out the present invention (hereinafter referred to as “embodiment”) will be described in detail with reference to the drawings.
In the description, the same reference numerals are used for the same elements, and redundant descriptions are omitted.

(First embodiment)
FIG. 1 is a perspective view showing an example of a seismic pier according to the first embodiment of the present invention. FIG. 2 is an enlarged view of part A in FIG. FIG. 3 is a perspective view illustrating an example of a connecting member. FIG. 4 is a plan view showing an example of the earthquake-resistant pier according to the first embodiment of the present invention.

As shown in FIG. 1, the earthquake-resistant pier 10 according to the first embodiment of the present invention includes a plurality of column members 20 and connecting members 30 that connect adjacent column members 20, 20. The column members 20, 20... Are erected on the foundation. The seismic bridge pier 10 is a seismic bridge pier that receives a load from directly above, and only one pillar member 20 does not serve as the earthquake resistant bridge pier 10, but a plurality of pillar members 20, 20. , Connecting the adjacent column members 20 by the connecting members 30, 30...
In the present embodiment, a case of a single pier type using four column members 20 constituting the earthquake-resistant pier 10 will be described.

A steel pipe pile K is used as a foundation on which the column member 20 of the earthquake-resistant pier 10 is erected, and the steel pipe pile K is disposed on each vertex (see FIG. 4) forming a regular square with respect to the ground. Moreover, each steel pipe pile K, K ... is provided in the ground leaving the upper end part on the ground surface (refer FIG. 1).
Therefore, the column members 20, 20... Standing on the upper ends of the steel pipe piles K, K... Are also located on the vertices forming a regular square with respect to the ground.

As shown in FIG. 2, the column member 20 is hollow and uses a long steel pipe material. For example, a steel pipe material used as a pile can be used. The column member 20 is erected by joining the lower end portion thereof to the upper end portion of the steel pipe pile K which is a foundation.
Here, the lower end (base) of the column member 20 joined to the steel pipe pile K may be filled with concrete (composite structure) (not shown). Thereby, the earthquake resistance of each pillar material 20 can be improved.

Moreover, the column material 20 can also be used by connecting a steel pipe pile of a predetermined length in the axial direction. Therefore, the height of the earthquake-resistant pier 10 of the present invention can be changed as appropriate in accordance with the height required for the pier.
As shown in FIG. 1, a beam member H is provided on the upper portion of each column member 20, and a bridge girder member (not shown) can be installed on the beam member H.

  As shown in FIG. 3, the connecting member 30 includes a steel member 31 for mounting attached to the column member 20 (see FIGS. 1 and 2) and a steel member 32 having a low yield point provided between the steel member 31 for mounting. The mounting steel material 31 is made of a plate-shaped steel material having high rigidity, and the low yield point steel material 32 is a plate having a yield point lower than the yield point of each of the column members 20 and the mounting steel material 31. Steel material is used. The low yield point steel 32 is joined to the mounting steel 31 by welding or bolts and nuts (not shown).

  The mounting steel 31 and the low yield steel 32 joined to both ends of the low yield steel 32 are used as a web of I-type steel. Thereby, the shearing force which the earthquake-resistant bridge pier 10 receives will be handled by the steel 31 for attachment and the low yield point steel 32 of the both ends used as a web. In addition, steel flanges F and F having a higher yield point than the low yield point steel material 32 are provided at the upper and lower portions of the attachment steel material 31 and the low yield point steel material 32 at both ends to be the web.

  As shown in FIG. 2, the connecting member 30 is disposed between adjacent column members 20, 20, and the column member 20 side end portion of the mounting steel material 31 of the connecting member 30 is welded to the column member 20. It is attached with a nut (not shown).

  Here, the connecting member 30 can be appropriately arranged at predetermined intervals in the height direction with respect to the position of the ground G (see FIG. 1), depending on the length of the column member 20.

  As shown in FIG. 1, when a plurality of connecting members 30 are attached to the pillar member 20, the attachment interval of the connecting members 30 is, for example, when the pillar member 20 having a length of 30 m from the ground G is used. The first connecting member 30A is attached at a position 10 m in the height direction from the ground G, and the second and third connecting portions are provided at two locations 6 m above the height direction from the position where the first connecting member 30 A is attached. The members 30B and 30C can be attached.

  In this way, the column members 20, 20 adjacent to the connecting members 30 so as to form four sides of the regular square are formed on the respective column members 20, 20. And the four pillar members 20, 20... Are bundled to form a single pier type earthquake-resistant pier 10 (one pier is provided).

In this earthquake-resistant pier 10, the role of the connecting members 30, 30 ... when an earthquake occurs will be described. FIG. 5 is a plan view showing the displacement of the upper ends of the column members 20 and 20 when the seismic pier 10 is shaken by an earthquake when the seismic pier 10 is viewed from the direction of arrow B in FIG. ) Is a plan view showing a case where the upper end portions of the column members 20, 20... Are displaced to the west side, and (b) is a case where the upper end portions of the column members 20, 20,. FIG. FIG. 6 is a side view showing an example of a state in which the column member 20 of the earthquake-resistant pier 10 is bent.
In the direction of east, west, south, and north, the upper direction is north, the lower direction is south, the left direction is west, and the right direction is east.

  As shown in FIG. 6, when the earthquake swaying in the east-west direction occurs, each column member 20, 20... Bends from the lower end joined to the steel pipe pile K into a substantially S shape. At this time, when the column members 20, 20... Are bent to the west side, as shown in FIG. 5 (a), when the column members 20, 20,. The relative displacement occurs between the attachment position of the column member 20 on the northwest side 30 and the attachment position of the column member 20 on the northeast side, and the connecting member 30 on the north side receives a shearing force. Similarly, relative displacement occurs between the mounting position of the column member 20 on the southwest side of the connecting member 30 on the south side and the mounting position of the column member 20 on the southeast side, and the connecting member 30 on the south side receives a shearing force. On the other hand, the linking member 30 on the west side and the linking member 30 on the east side are hardly affected by the shearing force.

  Thus, when an earthquake occurs, the column members 20 and 20 are bent into a substantially S shape, the north-side connecting member 30 and the south-side connecting member 30 receive a shearing force, and the column members 20, 20. Before reaching the end, the steel members 31 and 31 and the flanges F and F of the connecting members 30 and 30 on the north side and the south side, and the low yield point steel materials 32 and 32 yield earlier than the column members 20, 20. This prevents the column members 20, 20 ... from collapsing.

Further, the low yield point steel material 32 of the north side connecting member 30 and the low yield point steel material 32 of the south side connecting member 30 may be either the north side or the south side connecting members 30, 30 or one of them depending on the magnitude of the earthquake. Can yield to prevent the column members 20, 20 ... from collapsing.
Therefore, the low yield point steel material 32 of the connecting member 30 absorbs the seismic force (seismic energy), so that the low yield point steel material 32 yields faster than the respective column members 20 and the mounting steel material 31 without being damaged. The collapse of the column member 20 can be prevented. That is, the low yield point steel material 32 of the connecting member 30 yields as a substitute for each column material 20, whereby each column material 20 can be protected.
Here, the yield indicates a state in which the steel material enters the plastic region while having a function as a steel material. Moreover, damage has shown that the steel material is in the state which cannot fulfill the function.

  Moreover, when the earthquake swaying on the north-south side occurs, the column members 20, 20,... Are bent so as to repeat from the lower end attached to the steel pipe pile K to the north-south side. At this time, a case where each column member 20, 20... Is bent to the north side will be described. As shown in FIG. 5 (b), when the column members 20, 20,. A relative displacement occurs between the attachment position of the column member 20 on the northwest side 30 and the attachment position of the column member 20 on the southwest side, and the linking member 30 on the west side receives a shearing force. Similarly, relative displacement occurs between the attachment position of the column member 20 on the northeast side and the attachment position of the column member 20 on the southeast side of the linking member 30 on the east side, and the linking member 30 on the east side receives a shearing force. On the other hand, the connecting member 30 on the north side and the connecting member 30 on the south side are hardly affected by the shearing force.

  When the connecting member 30 on the west side and the connecting member 30 on the east side receive a shearing force, the steel members 31 and 31 for mounting the connecting members 30 and 30 on the west side and the east side before the column members 20, 20. Further, the low yield point steel materials 32, 32 yield earlier than the flanges F, F, and the column members 20, 20,... To prevent the collapse of the column members 20, 20,.

  Further, the low yield point steel 32 of the west connecting member 30 and the low yield point steel 32 of the east connecting member 30 may be either the west or east connecting members 30, 30 or either of them depending on the magnitude of the earthquake. By yielding, it is possible to prevent the column members 20, 20 ... from collapsing.

Moreover, although the earthquake-resistant pier 10 is not shown in the figure, when an earthquake swaying in the northwest-southeast side or the northeast-southwest side occurs, each column member 20, 20. It is bent so that it repeats to the east side or the northeast-southwest side, and the connecting members 30, 30... On the north side, the south side, the west side, and the east side receive a shearing force in a horizontal plane.
When these connecting members 30, 30... Receive a shearing force in a horizontal plane, they elastically deform within a range not exceeding the yield point, but before the yield point is exceeded, from the mounting steel material 31, the flange F, and the column material 20. As soon as the low yield point steel materials 32, 32... Are yielded by the shearing force in the vertical plane, the column materials 20, 20.

  Thereby, even if the earthquake which shakes in all directions occurs, it can be set as the earthquake-resistant pier 10 which does not collapse.

  Moreover, the low yield point steel 32 yielded by the earthquake can be replaced with a new low yield point steel. Since the low yield point steel material 32 yielded by the earthquake can be visually confirmed, the low yield point steel material 32 yielded can be easily found. The yielding low yield point steel 32 is removed by cutting or removing bolts and nuts from the mounting steel 31 at both ends of the connecting member 30. And it joins to the steel material 31 for attachment of the both ends of the connecting member 30 by the welding in the position where the low yield point steel material 32 which yielded the new low yield point steel material was removed.

  As described above, since the earthquake-resistant pier 10 is configured, it is possible to reduce the construction cost, and it is possible to surely cope with the shaking of the earthquake occurring in an uncertain direction.

(Second embodiment)
The earthquake-resistant pier 11 according to the second embodiment of the present invention is different from the first embodiment in that the connecting member includes a rubber damper member.
FIG. 7 is a partial perspective view showing an example of an earthquake-resistant pier according to the second embodiment of the present invention. FIG. 8 is a perspective view showing an example of a connecting member of an earthquake-resistant pier according to the second embodiment of the present invention. FIG. 9 is a plan view showing an example of an earthquake-resistant pier according to the second embodiment of the present invention. FIG. 10 is a plan view showing an example of a state in which the earthquake-resistant pier according to the second embodiment of the present invention is shaken by an earthquake. FIG. 11 is a side view showing an example of a state in which the column member 20 of the earthquake-resistant pier 11 is bent.

As shown in FIG. 7 and FIG. 9, the connecting member 40 of the earthquake-resistant pier 11 according to the second embodiment of the present invention is composed of mounting steel materials 41 and 41 and a rubber damper member 42. When the 11 column members are shaken due to an earthquake or the like, the column members 20, 20... Play a role to prevent buckling or collapse of the column members 20, 20.
As shown in FIG. 8, the mounting steel material 41 has a box shape, one end is attached to the column member 20, and the other end is attached to a rubber damper member 42 described later. Yes.
The rubber damper member 42 is a laminated rubber rubber bearing used for general bridge bearings. For example, the rubber damper member 42 has a function of shearing deformation due to relative displacement of each column member 20 during an earthquake and withstanding the shearing force received by the relative displacement. Fulfill.
As shown in FIGS. 8 and 9, the rubber bearing of the laminated rubber used for the rubber damper member 42 has a mounting steel material 41, so that the laminated surface is parallel to the standing direction of the column member 20. 41 is attached.

  In this earthquake-resistant pier 11, the role of the connecting members 40, 40... When an earthquake occurs will be described. In the direction of east, west, south, and north, the upper direction is north, the lower direction is south, the left direction is west, and the right direction is east on the page of FIG.

  As shown in FIG. 10, for example, when the earthquake swaying in the northeast-southwest side occurs, each column member 20, 20... Extends from the lower end joined to the steel pipe pile K to the northeast-southwest side. The connecting members 40, 40... On the north side, the south side, the west side, and the east side are subjected to a shearing force by being bent repeatedly.

  At this time, the state of the shaking of the earthquake-resistant bridge pier 11 in plan view will be described. As shown in FIG. 10, the column member 20 on the northwest side and the column member 20 on the southeast side are bent away from each other, and the column member on the northeast side. 20 and the column member 20 on the southwest side bend in a direction approaching each other. For this reason, the column member 20 on the northwest side and the column member 20 on the northeast side and the column member 20 on the northwest side and the column member 20 on the southwest side are displaced relative to each other, and are connected to the respective column members 20, 20. The member 40 receives a shearing force. Similarly, the column material 20 on the southeast side and the column material 20 on the northeast side, and the column material 20 on the southeast side and the column material 20 on the southwest side are displaced relative to each other, and are connected to the column materials 20, 20. The member 40 receives a shearing force. Then, the rubber damper members 42 of the connecting members 40, 40... Are elastically deformed, and the connecting members 40, 40.

Moreover, the state of the shaking of the earthquake-resistant pier 11 in a side view will be described. As shown in FIG. 11, the column members 20 and 20 are shaken so as to have a substantially S shape by the shaking of the earthquake. At this time, a shearing force is applied to the connecting member 40 provided between the adjacent column members 20 and 20 due to the relative displacement of the column members 20 and 20 that are bent in a substantially S shape. At this time, the shearing force acts on the rubber damper member 42 to cause the rubber damper member 42 to undergo shear deformation.
These linking members 40, 40,... Can withstand the shearing force applied by their own elastic force, so that the column members 20, 20,.

Thereby, even if the earthquake which shakes in all directions occurs, it can be set as the earthquake-resistant pier 11 which does not collapse.
The rubber damper member 42 can be used repeatedly even when an earthquake occurs. However, when the rubber damper member 42 deteriorates, it can be replaced with a new rubber damper member.
Thus, since the earthquake-resistant pier 11 was comprised, construction cost reduction can be implement | achieved and it can respond reliably also to the shaking of the earthquake which generate | occur | produces in an uncertain direction.

Therefore, the rubber damper member 42 which is a constituent element of the connecting member 40 of the earthquake-resistant bridge pier 11 according to the second embodiment is a low yield point steel material which is a constituent element of the connecting member 30 of the earthquake-resistant bridge pier 10 according to the first embodiment. Although the low yield point steel 32 needs to be replaced every time it yields, the rubber damper member 42 can withstand repeated use, although it is more expensive than 32, the seismic resistance according to the second embodiment. The total construction cost of the pier 11 can be reduced.
Thereby, the earthquake-resistant pier 10 according to the first implementation site and the earthquake-resistant pier 11 according to the second embodiment can be provided at a lower cost than the conventional pier.

(Third embodiment)
Next, the case where the earthquake-resistant pier 10 which concerns on 1st embodiment is used as a leg part of a pier of a ramen structure is demonstrated. FIG. 12 is a perspective view showing an example of an earthquake-resistant pier having a ramen structure.

  As shown in FIG. 12, the seismic pier 12 according to the third embodiment of the present invention is arranged so that two seismic piers 10 according to the first embodiment are arranged on each column member 20, 20. It has a rigid frame structure in which the beam material H is mounted horizontally.

  As described above, the seismic bridge piers 12 of the ramen structure constructed in this way resists the shaking of the earthquake as described above even if an earthquake shaking in an uncertain direction occurs. The connecting member 30 connecting the 20 and 20 yields by absorbing the seismic force (earthquake energy) before the column member 20 collapses, and the column members 20, 20. Can be protected.

  As described above, since the ramen-structured earthquake-resistant bridge pier 12 is configured, low cost can be realized, and it is possible to cope with earthquake shaking that occurs in an uncertain direction.

  In addition, it replaces with the connection member 30 using the low yield point steel material 32, and there exists the same effect also as a structure which arranged the earthquake-resistant bridge pier 11 provided with the connection member 40 using the rubber damper member 42 in order.

  Heretofore, examples of preferred embodiments have been described for the present invention. However, the present invention is not limited to the above-described embodiment, and the design of each of the above-described components can be appropriately changed without departing from the spirit of the present invention.

For example, a footing buried in the ground can be used for the foundation in addition to the steel pipe pile. The footing is, for example, a concrete structure, the upper surface of which is rectangular, and is supported by a plurality of steel pipe piles provided in the ground. It is also possible to place and fix the column material on the upper surface of the footing supported in this manner, so as to form a polygon with respect to the upper portion of the footing, respectively, on the vertex of the polygon.
Therefore, the pillar material can be erected on the foundation without being limited to the kind of foundation that supports the pillar material.
The column members 20, 20... May be erected with their lower ends embedded in the footing. In this case, a stud is attached to the lower end portion of the column member 20 along the outer peripheral surface. Thereby, since the stud is caught by the hardened concrete, it is possible to prevent the column member 20 from coming out of the footing.

  In addition, the position of the column member is not limited to a regular square, and may be on each vertex of a polygon such as a triangle, a rectangle (rectangle), a pentagon, or a hexagon with respect to the ground.

  Moreover, according to the length of a pillar material (height of an earthquake-resistant pier), you may provide several steps, such as a 2 step | paragraph and 4 steps | paragraphs, in a height direction. By doing in this way, even if an earthquake-resistant bridge pier is used as a viaduct pier, it can respond to the shaking of the earthquake which occurs in an uncertain direction.

Moreover, the ground may be inclined. Therefore, when installing seismic piers on sloping ground, install steel pipe piles as the foundation on each vertex of the polygon so that a polygon is drawn on the sloping ground. The column material can be disposed on each vertex of the polygon by joining the lower end of the column material to the end portion exposed to the outside.
The seismic pier provided in this way can be used, for example, as a leg part of a ramen pier that is hung on an expressway or the like in which a leg part is installed on a slope.

It is a perspective view which shows an example of the earthquake-resistant pier which concerns on 1st embodiment of this invention. It is the A section enlarged view of FIG. It is a perspective view which shows an example of a connection member. It is a top view which shows an example of the earthquake-resistant pier which concerns on 1st embodiment of this invention. (A) is a top view which shows the case where a pillar material is displaced to one direction, (b) is a top view which shows the case where a pillar material is displaced to another direction. It is a side view which shows an example in the state where the pillar material of the earthquake-resistant pier was bent. It is a fragmentary perspective view which shows an example of the earthquake-resistant pier which concerns on 2nd embodiment of this invention. It is a perspective view which shows an example of the connection member of the earthquake-resistant bridge pier which concerns on 2nd embodiment of this invention. It is a top view which shows an example of the earthquake-resistant pier which concerns on 2nd embodiment of this invention. It is a top view which shows an example of the state where the earthquake-resistant pier concerning 2nd embodiment of this invention was shaken by the earthquake. It is a side view showing an example of the state where pillar material 20 of earthquake-resistant pier 11 bent. It is a perspective view which shows an example of an earthquake-resistant pier of a ramen structure. (A) is a side view which shows the conventional earthquake-resistant pier, (b) is a side view which shows the conventional earthquake-resistant pier which deform | transformed (a). It is a side view which shows the other conventional earthquake-resistant pier.

Explanation of symbols

10, 11, 12 Seismic bridge pier 20 Column material 30 Connecting member 31 Steel member for mounting 32 Low yield point steel member 40 Connecting member 41 Steel member for mounting 42 Rubber damper member F Flange G Ground K Steel pipe pile (foundation)

Claims (5)

A plurality of column members erected on the foundation, and a connecting member that connects the adjacent column members,
Each said pillar material is a steel pipe material, and when each said pillar material shakes, the said connection member deform | transforms, The earthquake-resistant bridge pier characterized by the above-mentioned.   The earthquake-resistant bridge pier according to claim 1, wherein the plurality of column members are respectively arranged on vertices forming a polygon. The connecting member includes a mounting steel material to be attached to each column member, and a low yield point steel material provided between the mounting steel materials,
The earthquake resistant pier according to claim 1 or 2, wherein a yield point of the low yield point steel material is set lower than a yield point of the mounting steel material and the column material. The connecting member includes a mounting steel material to be attached to each column member, and a rubber damper member provided between the mounting steel materials,
The earthquake-resistant bridge pier according to claim 1 or 2, wherein the rubber damper member undergoes shear deformation.   The earthquake-resistant pier according to any one of claims 1 to 4, wherein the connecting member is provided so as to be replaceable.

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